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File:PC img08.jpg Tight spaces example © Bruno Postle(640 × 480 (53 KB)) - 17:29, 2 August 2021File:PC img09.jpg Corrected tight spaces example © Bruno Postle(467 × 480 (41 KB)) - 17:28, 2 August 2021File:220x120deg-panini-grid.png ...phere ruled with 3 sets of orthogonal lines spaced 10 degrees. Drawing by Bruno Postle.(3,000 × 1,819 (919 KB)) - 17:29, 2 August 2021